Question

Two men are going along a track of rail in the opposite direction. One goods train crossed the first person in 20 sec. After 10 min the train crossed the other person who is coming in opposite direction in 18 sec. After the train has passed, when the two persons will meet?

Answer 1

Answer:

90 minutes

Explanation:

Let ‘L’ be the length of train,

‘x’ be the speed of the first man,

‘y’ be the speed of the second man and ‘z’ be the speed of the train.

A/Q,

20 = L/(z−x) and 18 = L/(z+y)

(z+y)⇒ z=10x+9y

10min = 600sec

Distance between the two men =600(z+y)m

Time = {600(z+y)−600(x+y)}/(x+y)

= 600(9x+9y)/(x+y)sec

= 600x9sec

= 90min.